/*

 Copyright (C) 2014 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

  AAPLOverlayViewController implementation.

 */

#import "AAPLOverlayViewController.h"

@interface AAPLOverlayViewController ()

@property (nonatomic, strong) CIContext *context;

@property (nonatomic, strong) CIImage *baseCIImage;

@property (nonatomic, strong) CIFilter *colorControlsFilter;

@property (nonatomic, strong) CIFilter *hueAdjustFilter;

@end

@implementation AAPLOverlayViewController

{

    dispatch_queue_t processingQueue;

}

- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if(self)

    {

        // To indicate to the system that we have a custom presentation controller, use UIModalPresentationCustom as our modalPresentationStyle

        [self setModalPresentationStyle:UIModalPresentationCustom];

        [self setup];

    }

    return self;

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Set up our foreground and background views

    _foregroundContentView = [[UIVisualEffectView alloc] initWithEffect:[UIVibrancyEffect effectForBlurEffect:[self blurEffect]]];

    _backgroundView = [[UIVisualEffectView alloc] initWithEffect:[self blurEffect]];

    _foregroundContentScrollView = [[UIScrollView alloc] initWithFrame:[[self view] frame]];

    [self configureViews];

}

- (void)configureCIObjects {

    // Configure the objects we'll need for our Core Image filter

    if (!self.context) {

        self.context = [CIContext contextWithOptions:nil];

    }

    self.baseCIImage = [CIImage imageWithCGImage:[[[self photoView] image] CGImage]];

}

- (void)setPhotoView:(AAPLPhotoCollectionViewCell *)photoView {

    if ([self photoView] != photoView) {

        _photoView = photoView;

        [self configureCIObjects];

    }

}

- (AAPLPhotoCollectionViewCell *)photoView

{

    return _photoView;

}

- (void)sliderChanged:(id)sender

{

    CGFloat hue = [[self hueSlider] value];

    CGFloat saturation = [[self saturationSlider] value];

    CGFloat brightness = [[self brightnessSlider] value];

    // Update labels

    [[self hueLabel] setText:[NSString stringWithFormat:NSLocalizedString(@"Hue: %f", @"Hue label format."), hue]];

    [[self saturationLabel] setText:[NSString stringWithFormat:NSLocalizedString(@"Saturation: %f", @"Saturation label format."), saturation]];

    [[self brightnessLabel] setText:[NSString stringWithFormat:NSLocalizedString(@"Brightness: %f", @"Brightness label format."), brightness]];

    // Apply effects to image

    dispatch_async(processingQueue, ^{

        if (!self.colorControlsFilter) {

            self.colorControlsFilter = [CIFilter filterWithName:@"CIColorControls"];

        }

        [self.colorControlsFilter setValue:self.baseCIImage forKey:kCIInputImageKey];

        [self.colorControlsFilter setValue:@(saturation) forKey:@"inputSaturation"];

        [self.colorControlsFilter setValue:@(brightness) forKey:@"inputBrightness"];

        CIImage *coreImageOutputImage = [self.colorControlsFilter valueForKey:kCIOutputImageKey];

        if (!self.hueAdjustFilter) {

            self.hueAdjustFilter = [CIFilter filterWithName:@"CIHueAdjust"];

        }

        [self.hueAdjustFilter setValue:coreImageOutputImage forKey:kCIInputImageKey];

        [self.hueAdjustFilter setValue:@(hue) forKey:@"inputAngle"];

        coreImageOutputImage = [self.hueAdjustFilter valueForKey:kCIOutputImageKey];

        CGImageRef cgImage = [self.context createCGImage:coreImageOutputImage fromRect:CGRectMake(0,0,[[[self photoView] image] size].width, [[[self photoView] image] size].height)];

        UIImage *image = [UIImage imageWithCGImage:cgImage];

        CGImageRelease(cgImage);

        dispatch_async(dispatch_get_main_queue(), ^{

            [[self imageView] setImage:image];

        });

    });

}

- (void)savePushed:(id)sender

{

    // When saving, set our processed image on the photo view, and dismiss ourselves

    [[self photoView] setImage:[[self imageView] image]];

    [[self presentingViewController] dismissViewControllerAnimated:YES completion:NULL];

}

- (UISlider *)configuredOverlaySlider

{

    UISlider *slider = [[UISlider alloc] init];

    [slider setTranslatesAutoresizingMaskIntoConstraints:NO];

    [slider addTarget:self action:@selector(sliderChanged:) forControlEvents:UIControlEventValueChanged];

    [slider setContinuous:NO];

    return slider;

}

- (void)setup

{

    // Set up our image view, blur effect, and image processing queue

    _imageView = [[UIImageView alloc] init];

    [[self imageView] setContentMode:UIViewContentModeScaleAspectFit];

    [[self imageView] setTranslatesAutoresizingMaskIntoConstraints:NO];

    _blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight];

    processingQueue = dispatch_queue_create("image processing queue", DISPATCH_QUEUE_SERIAL);

}

- (void)configureViews

{

    // Set up our foreground labels, sliders and other views

    [[self imageView] setImage:[[self photoView] image]];

    [[self view] setBackgroundColor:[UIColor clearColor]];

    [[self backgroundView] setTranslatesAutoresizingMaskIntoConstraints:NO];

    [[self foregroundContentScrollView] setTranslatesAutoresizingMaskIntoConstraints:NO];

    [[self foregroundContentView] setTranslatesAutoresizingMaskIntoConstraints:NO];

    _hueLabel = [[AAPLOverlayVibrantLabel alloc] init];

    _hueSlider = [self configuredOverlaySlider];

    [[self hueSlider] setMaximumValue:10.0];

    _saturationLabel = [[AAPLOverlayVibrantLabel alloc] init];

    _saturationSlider = [self configuredOverlaySlider];

    [[self saturationSlider] setValue:1.0];

    [[self saturationSlider] setMaximumValue:2.0];

    _brightnessLabel = [[AAPLOverlayVibrantLabel alloc] init];

    _brightnessSlider = [self configuredOverlaySlider];

    [[self brightnessSlider] setMinimumValue:-0.5];

    [[self brightnessSlider] setMaximumValue:0.5];

    _saveButton = [UIButton buttonWithType:UIButtonTypeSystem];

    [[self saveButton] setTranslatesAutoresizingMaskIntoConstraints:NO];

    [[self saveButton] setTitle:NSLocalizedString(@"Save", @"Save button title.") forState:UIControlStateNormal];

    [[[self saveButton] titleLabel] setFont:[UIFont systemFontOfSize:32.0]];

    [[self saveButton] addTarget:self action:@selector(savePushed:) forControlEvents:UIControlEventTouchUpInside];

    [[self view] addSubview:[self backgroundView]];

    [[self view] addSubview:[self foregroundContentScrollView]];

    [[self foregroundContentScrollView] addSubview:[self foregroundContentView]];

    [[[self foregroundContentView] contentView] addSubview:[self hueLabel]];

    [[[self foregroundContentView] contentView] addSubview:[self hueSlider]];

    [[[self foregroundContentView] contentView] addSubview:[self saturationLabel]];

    [[[self foregroundContentView] contentView] addSubview:[self saturationSlider]];

    [[[self foregroundContentView] contentView] addSubview:[self brightnessLabel]];

    [[[self foregroundContentView] contentView] addSubview:[self brightnessSlider]];

    [[[self foregroundContentView] contentView] addSubview:[self saveButton]];

    [[self foregroundContentScrollView] addSubview:[self imageView]];

    // Add constraints

    NSDictionary* views = @{

                 @"backgroundView" : [self backgroundView],

    @"foregroundContentScrollView" : [self foregroundContentScrollView],

          @"foregroundContentView" : [self foregroundContentView],

                       @"hueLabel" : [self hueLabel],

                      @"hueSlider" : [self hueSlider],

                @"saturationLabel" : [self saturationLabel],

               @"saturationSlider" : [self saturationSlider],

                @"brightnessLabel" : [self brightnessLabel],

               @"brightnessSlider" : [self brightnessSlider],

                     @"saveButton" : [self saveButton],

                      @"imageView" : [self imageView]

    };

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[backgroundView]|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[backgroundView]|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[foregroundContentScrollView]|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[foregroundContentScrollView]|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[foregroundContentView]|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[foregroundContentView]|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[hueLabel]-|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[hueSlider]-|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[saturationLabel]-|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[saturationSlider]-|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[brightnessLabel]-|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[brightnessSlider]-|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[saveButton]-|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[imageView(==foregroundContentScrollView)]|" options:0 metrics:nil views:views]];

    [[self view] addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(>=30)-[hueLabel]-[hueSlider]-[saturationLabel]-[saturationSlider]-[brightnessLabel]-[brightnessSlider]-[saveButton]-(>=10)-[imageView(==200)]|" options:0 metrics:nil views:views]];

    [self sliderChanged:nil];

}

@end

@implementation AAPLOverlayVibrantLabel

// This is a simple UILabel subclass to change the text color based on the tint

// color of the label

- (instancetype)initWithFrame:(CGRect)frame

{

    self = [super initWithFrame:frame];

    if(self)

    {

        [self setTranslatesAutoresizingMaskIntoConstraints:NO];

    }

    return self;

}

- (void)tintColorDidChange

{

    [self setTextColor:[self tintColor]];

}

@end